Enter Mugen, Honda's factory tuning house. Mugen has announced that it will build up to 300 supercharged "CR-Z Mugen RZs" for the Japanese market, with sales starting from November 26.

The addition of a centrifugal supercharger raises power from the CR-Z's 1.5 litre inline four to 115kW, and lifts torque to 185Nm. A titanium cat-back exhausts helps the engine breathe easier at higher revs, while also reducing weight.

The standard CR-Z's electric assistance motor is retained, and adds an extra 15kW and 78Nm. That gives the CR-Z Mugen RZ at total power output of 130kW - 29kW more than the incoming 2013 CR-Z, and a substantial 39kW more than the model currently on sale in Australia.

Mugen has also addressed the CR-Z's braking and handling, with five-way adjustable dampers and big 330mm front brakes added to the CR-Z's spec list.

An adjustable rear wing adds more downforce over the rear of the car, and a revised aero package and forged 17-inch alloys enhance the CR-Z's already rakish profile.

Interior mods are mild by comparison, with blue upholstery, blue stitching on the leather wheel, a boost guage and a carbon fibre gear knob the only notable changes.

The price for all this? 4,494,000 Yen, or AU$56,420. Not that it matters though: you'll have to be a Japanese resident to buy one.